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| author | Bernhard Schommer <bschommer@users.noreply.github.com> | 2018-09-12 14:32:01 +0200 |
|---|---|---|
| committer | Xavier Leroy <xavierleroy@users.noreply.github.com> | 2018-09-12 14:32:01 +0200 |
| commit | 591073be98300e1c07527af45c7c4ce8dff5bc39 (patch) | |
| tree | 1f5143b8405b4d33a6133a7210839dab1e6eaad6 /arm/AsmToJSON.ml | |
| parent | 25ba7367a0d9391a4bea2d7685b8cfe8e304e2f8 (diff) | |
| download | compcert-kvx-591073be98300e1c07527af45c7c4ce8dff5bc39.tar.gz compcert-kvx-591073be98300e1c07527af45c7c4ce8dff5bc39.zip | |
Generate a nop instruction after some ais annotations (#137)
* Generate a nop instruction after ais annotations.
In order to prevent the merging of ais annotations with following
Labels a nop instruction is inserted, but only if the annotation
is followed immediately by a label.
The insertion of nop instructions is performed during the
expansion of builtin and pseudo assembler instructions and is
processor independent, by inserting a __builtin_nop built-in.
* Add Pnop instruction to ARM, RISC-V, and x86
ARM as well as RISC-V don't have nop instructions that can
be easily encoded by for example add with zero instructions.
For x86 we used to use `mov X0, X0` for nop but this may
not be as efficient as the true nop instruction.
* Implement __builtin_nop on all supported target architectures.
This builtin is not yet made available on the C side for all architectures.
Bug 24067
Diffstat (limited to 'arm/AsmToJSON.ml')
| -rw-r--r-- | arm/AsmToJSON.ml | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arm/AsmToJSON.ml b/arm/AsmToJSON.ml index 276ceecc..3874e141 100644 --- a/arm/AsmToJSON.ml +++ b/arm/AsmToJSON.ml @@ -30,7 +30,7 @@ let mnemonic_names = [ "Padc"; "Padd"; "Padds"; "Pand";"Pannot"; "Pasr"; "Pb"; " "Pftouizs"; "Pfuitod"; "Pfuitos"; "Pinlineasm"; "Pisb"; "Plabel"; "Pldr"; "Ploadsymbol_lbl"; "Pldr_p"; "Pldrb"; "Pldrb_p"; "Pldrh"; "Pldrh_p"; "Pldrsb"; "Pldrsh"; "Plsl"; "Plsr"; "Pmla"; "Pmov"; "Pmovite"; - "Pmovt"; "Pmovw"; "Pmul"; "Pmvn"; "Ploadsymbol_imm"; "Porr"; + "Pmovt"; "Pmovw"; "Pmul"; "Pmvn"; "Ploadsymbol_imm"; "Pnop"; "Porr"; "Ppush"; "Prev"; "Prev16"; "Prsb"; "Prsbs"; "Prsc"; "Psbc"; "Psbfx"; "Psdiv"; "Psmull"; "Pstr"; "Pstr_p"; "Pstrb"; "Pstrb_p"; "Pstrh"; "Pstrh_p"; "Psub"; "Psubs"; "Pudiv"; "Pumull" ] @@ -263,6 +263,7 @@ let pp_instructions pp ic = | Pmovw(r1, n) -> instruction pp "Pmovw" [Ireg r1; Long n] | Pmul(r1, r2, r3) -> instruction pp "Pmul" [Ireg r1; Ireg r2; Ireg r3] | Pmvn(r1, so) -> instruction pp "Pmvn" [Ireg r1; Shift so] + | Pnop -> instruction pp "Pnop" [] | Porr(r1, r2, so) -> instruction pp "Porr" [Ireg r1; Ireg r2; Shift so] | Ppush(rl) -> instruction pp "Ppush" (List.map (fun r -> Ireg r) rl) | Prev(r1, r2) -> instruction pp "Prev" [Ireg r1; Ireg r2] |